Organizational Management in SAP is based on the concept that each element in an organization represents a stand-alone object with individual characteristics. These objects are created and maintained separately, then linked together through relationships to form a network which has the flexibility to handle human resource forecasting, and reporting.
In this SAP HR User Manual, you will find introductory and HR data maintaining notes of following topics,
Building Blocks in Organizational Management
Relationships between the Organizational Management Objects